I think I remember seeing somewhere that if you use a FireWire 800 cable then you can charge ipods while the computer is in sleep. Might be an idea to look into that? I'm on my iPod touch at the moment so can't really look too much :p

I keep seeing/reading that it is possible to charge my iPhone while the iMac is asleep...is this true?

I have my iPhone directly connected to the USB ports on the back and regardless of which port I use, when I sleep my iMac, the iPhone stops charging...

Mark

I have same set-up - and wondering how you find charging the iPhone from the usb port on the keyboard, if you have the wired version. My new iPhone was charging from it, while iMac is awake, anyway, but just lately it seems not to be able to charge.
I have a powered usb hub hanging off the back, but all the ports are full with scanner, printer, elgato TV, and um,,, other stuff I can't recall without looking .

I have same set-up - and wondering how you find charging the iPhone from the usb port on the keyboard, if you have the wired version. My new iPhone was charging from it, while iMac is awake, anyway, but just lately it seems not to be able to charge.
I have a powered usb hub hanging off the back, but all the ports are full with scanner, printer, elgato TV, and um,,, other stuff I can't recall without looking .

Is the keyboard USB port powered?

Yes it is powered. I've been using a usb cord attached to the keyboard to sync and charge my iPhone/iPod for many months now.